CSMC 3805 Codes, CSMC User Guide.
There is a code displayed on the controller screen. What does this mean?
The codes display the plant status under certain conditions. They are as follows:
L05 = Return Water Temperature Low Limit.
F = Water Frost Limit (Flow or Return).
L01 = Inside Low Limit (Frost).
H4 = Flow Water High Limit.
A = Alarm (If alarm display is not required set code B61 to 1).
0 to 9 = Optimiser Status (only displayed if code B49 is set to 1).
The User Guide can be downloaded from here.